Objectives : This study aimed to investigate relationship between the psychological factors, the prevalence, and perception of temporomandibular disorder in Korean adults. Methods : A total of 7203 data were derived from Korean national health and nutritional examination survey. All data were analyzed using R-COMMANDER(12.2 SDI) program. Results : The prevalence of temporomandibular disorder in Korean adults was 3.1% and 10.5% of adults with temporomandibular disorder (TMD) had more than one TMD related symptom. Women had higher prevalence rate of TMD related symptom than men. Prevalence rate in TMD was low in the younger age, the higher education level, higher income, and the professionals. Psychological factors including cognition of stress and depression was shown to be closely related with suicidal ideation and TMD prevalence. Conclusions : To prevent TMD, it is necessary to provide the systematic oral health education and to develop the combined psychological counseling with treatment program.